User's Manual

AXELL MBF-40 AMERICAS REPEATER
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc. No. 00071UM Rev. 3.4 3
1.2 ALC
The repeater has a constant gain in both uplink and downlink paths. The repeater has a
defined maximum output level. If the input signal amplified by the gain set exceeds the
set output limit, an ALC (Automatic Level Control) loop is activated. This ALC ensures
that the amplifier does not add distortion to the radio signal. Below are examples of the
ALC function for one and two carriers.
Figure 1-2: ALC
1.3 MIMO Topology
MIMO configuration is supported by specific MBF-40 models. The physical casing of
these models supports two antenna ports and includes two (internal) optic conversion
modules (see section
1.7.3.4).
MBF-40 MIMO topology requires an OMU II unit that supports at least two sectors. Two
dedicated optic Fibers are routed from the OMU II towards the MBF-40.
Where relevant, MIMO specific installation instructions are provided in the manual.
Figure 1-3: MIMO OMU II-MBF-40 Remote Application
ALC one carrier
Input signal, dBm
Output power, dBm
+36,5
+33,8
-24 -16
Gain: 60 dB
+35
ALC two carriers